Yet the ability to check out the resort’s wares at any time did not appear to deter opening day crowds.Īccording to MGM, about 10,000 people showed up for grand opening festivities outside, a mass that stretched all the way around the block from State Street to Main Street. The casino and resort, a $960 million project MGM began in 2011, will be open 24 hours a day, 365 days a year. SPRINGFIELD - When MGM Springfield officially opened its doors Friday morning, one thing was certain: As long as it is in business, it will never close.